Coated paper



Sept. 4, 1928.

F. w. FARRELL COATED PAYER Filed July 17, 1925 ADHESIVE COATING ADHEJ/VfCOATING PAPER FILLER Patented Sept. 4, 1928.

UNITED STATES PATENT OFFICE.

FREDERICK W. FARRELL, OEBROOKFIELI), MASSACHUSETTS, ASSIGNOBTO MCLAURIN-JONES (70., OF BRO OKFIELD, MASSACHUSETTS, A CORPORATION OF MASSACHU-SETTS.

COATED PAPER.

Application filed July 17, 1925. Serial No. 44,358.

This invention relates to coated papers, and more especially to guminedpapers, cloth, and other sheet ma terials, hereinafter referred to aspaper.

It is now a common practice to apply paint, varnish, and the like, tofurniture, automobiles, and other articles, bymeans of a spray gun. Insprayingthe paint onsome kinds of work, it is necessary to protect someparts of the work from the spray. This is particularly true in paintingautomobiles since different parts of an automobile. are often painted indifferent colors and some parts, such as the windshield, windows andupholstery must always be protected from the paint or varnish. Atpresent the usual practice is to cover the parts to be protected withnewspapers, or other cheap paper, and to hold the paper in' place bymeans of surgeons tape or ordinary gumme'd sealingtape.

The surgeons tape is expensive, and the sealing tape can be removedafter the work is finished only with considerable difficulty.

It is essential that the adhesive tape used shall have sufficientstrength and adhesi ii to hold the covering paper from being blow offthe workby the force of the blast of air which creates the spray. At thesame time it is desirable that the paper be stripped ofi o easily whenthe work is finished, and-that any of the adhesive 'whichis left on thework be of such a character-that it can be easily removed. I

The present invention aims to devise an 5 adhesively coated paperwhi'chwill berelatively inexpensive to manufacture and will beespecially adapted for use under the conditions above described. I

I have found that the foregoing. require- 40 ments are satisfied by apaper coated with a water soluble adhesive carrying a sufficientquantity of glycerine' or some other hygroscopic agent to keep theadhesive tacky under normal atmospheric conditions. The adhegive usedmay consist of Irish moss, latine glue, gum tragacanth, or the like. ofits low price I prefer to-us'e'Irish'moss, but since the adhesiveproperties of thismaterial vary considerably, I add to it a certainpercentage of gelatine glue or some equivalent material which is of amore uniform character. A formula which has proved sat nisfj cjpryconsists of- 10 parts, by weight, of Irish iToss',8 parts of gelatmeglue, 125 parts ecause of water, and'60 parts of glycerine. This formulamay, however, be varied considerably, and I have found that good resultsare produced by using from 8 to 15 parts 'of' Irish moss, with gelatineglue varying from zero to 10 parts, glycerine from 45 to 75 parts, andwater from 125 to 275 parts. Also, other water soluble adhesives may beused in .place of those mentioned.

An adhesive material made by formulae such as those above given can beapplied to the paperwith the usual coating machinery. A large art of thewater subsequently is driven oil by drying so that the quantity of waterremaining in the coated paper when it is ready for the market isapproximatel equal to the glycerine. In this condition e coating istacky under normal atmospheric conditions and will remain tackypractically indefinitely. p v

I prefer to use a relatively strong paper, such as a kraft paper, and tocoat one side of the paper with starch; casein, or some other fillingmaterial which will protect the paper from abrasion. The BdhQSIVGCOatiIIg is-applied to the opposite side of the paper.

Figs. 1- and 2 of the accompanying draw ings are perspective andcross-sectional views, respectively, illustratin a coated paperembodying this invention. he paper sheet is shown at 2, the adhesivecoating at 3, and

the filling material at 4. It will be understood that the thickness ofthe paper and coatings necessarily is exaggerated in Fig. 2.

In order to prevent the paper when wound in rolls or stacked in sheetsfrom sticking together andcaking, I-prefer to insert a strip or sheet ofglassine or' other moisture resist- 'ing paper between adjacent sheetsof the g'ummed paper.

This gummed paper is-used in the. usual manner either directly to coverthe surface to be protected from the paint or varnish spray, or instrips to secure another protective paper to the work. The adhesivecoating is usually moistened before the paper is-applied to the work inorder to increase the tackiness of the coating, and whenthe 'work isfinished the paper can easil be stripped ,o'fi due to the act'that the ahesive coating has remained A tacky or sticky. The paper can then beused again eitherwith or without additional moistening. Usually it isnot-necessary to .moistenlit for subsequent applicationabut I this maybe necessary occasionally due to the fact that the solvent used 'in thepaint sometimes dries out a certain amount of the water in the adhesivecoating. The fact that the back of the paper, that is, the surface whichis not covered with adhesive, is coated with a filler which protects thepaper against roughing up when it is rubbed in being applied to thework, greatly increases the life of the paper.

While I have herein disclosed the best embodiment of my invention that Ihave so far devised, it will be appreciated that the inven tion issusceptible "of embodiment in many forms without departing 'from thespirit or scope thereof.

Having thus described my invention,*what I desire to claim as new is:

1. An article of the character described comprising paper having oneside thereof 2 ing a small percentage of a water soluble adhesive, alarger percentage of glycerine, and a proportion of water approximatelyequal to that of glycerine. I I

3. An article of the character described comprising a relatively strongsheet of paper having on one side thereof a coating to protect itagainst abrasion, and on its opposite side a coating of a relativelyweak water soluble adhesive including a substantial percentage ofglycerine.

FREDERICK W. FARRELL.

